Analysis on Change Characteristics of Sunshine in Benxi Mountainous Area in Recent 57 Years

[Objective] This study aimed to analyze the change characteristics of sunshine hours in Benxi mountainous area in recent 57 years.[Method] Based on the data of monthly sunshine hours,total cloudiness,vapor pressure and ≥0.1 mm precipitation days from Caohekou weather station during 1954-2010,by using linear tendency,Mann-Kendall method and wavelet analysis,the change characteristics of sunshine hours in Benxi mountainous area in recent 57 years were analyzed,as well as the possible climatic factors resulting in the decrease of sunshine hours.[Result] In recent 57 years,except for the slight increase of sunshine hours in winter,annual sunshine hours and sunshine hours in other seasons showed significantly decreasing trend,and annual sunshine hours varied abruptly in 1971.In addition,total cloudiness,vapor pressure and ≥0.1 mm precipitation days affected sunshine hours obviously,but sunshine hours didn't simply increase as the reduction of total cloudiness and ≥0.1 mm precipitation days,which showed that the influencing factors of sunshine hours were complex.[Conclusion] The research could provide scientific references for the reasonable utilization of light energy,adjustment of agricultural industrial structure and sustainable development of agricultural economy in mountainous areas.